Thank you for your reply. We use gray, 30 mins 60 C in Curebox.
we have 2, printed for same patient, one is not accurate, called service guy today.
Does hallowed model have less accuracy than solid? we make a lot of essix retainer for ortho final models
Depends a lot on the thickness of the hollowed model, and on the orientation you print the model.
The most accurate way to print will usually be a solid model, printed flat on the print bed.
Printing hollow may seem like your saving resin, but in reality, unless you're ok with copious drain holes, you're losing most of that resin in the wash process. Printing hollow also introduces issues with internal overhangs, which can affect accuracy.
Printing vertically is a somewhat common practice, but almost invariably results in overhangs over 45 degrees, which most printers don't like much, so you lose accuracy.
If you have a scanner, you can scan the printed model and compare it to the original STL. I do this to diagnose some of our fit issues...here's an example of a print that had some accuracy issues at the gingival margin: